Crown Prince Harald anxiously awaiting the bride as the guests pass by to be seated.
1. (towards the camera) Prince Henrik of The Netherlands and Countess Ruth of Rosenberg (wife of Count Flemming who was the best man at the wedding)
2. (in the center) Crown Princess Margarethe and Prince Henrik of Denmark
3. (on the left) King Frederik IX and Queen Ingrid of Denmark
4. (facing the camera) some dignataries
Bride arrives on the arms of her future father-in-law, King Olav

1-2. the couple in front of the altar
3.The groom arriving with his best man, Count Flemming of Rosenberg
4. President Kekkonen of Finland and his wife
5. King Frederik IX and Queen Ingrid of Denmark
6. Prince Claus of The Netherlands and Countess Ruth of Rosenberg
7. King Gustaf Adolf VI of Sweden and Princess Margaretha of Denmark
8. Mrs. Dagny Haraldsen (bride's mother) and King Olav
9. Count Charles and Countess Madeleine Ullens de Schooten
10. Princess Margarethe of Denmark and her husband, Prince Rene

Is there a reason why Prince Claus escorted Countess Ruth of Rosenberg into the church? Where was (then) Crown Princess Beatrix? And was/is not Countess Ruth married that her he could not have escorted her into the church? (I don't know anything about the Rosenbergs.)

Is there a reason why Prince Claus escorted Countess Ruth of Rosenberg into the church? Where was (then) Crown Princess Beatrix? And was/is not Countess Ruth married that her he could not have escorted her into the church? (I don't know anything about the Rosenbergs.)

Countess Ruth was married to Count Flemming of Rosenberg, who was Crown Prince Harald's best man. Thus, he was standing up with Harald.

Count Flemming of Rosenborg was also Harald's cousin, as he was son of Margaretha, sister of Crown Princess Märtha.

Is there a reason why Prince Claus escorted Countess Ruth of Rosenberg into the church? Where was (then) Crown Princess Beatrix? And was/is not Countess Ruth married that her he could not have escorted her into the church? (I don't know anything about the Rosenbergs.)

And like always, you are most welcome, Alexandria:)

As Norwegianne has kindly answered the question about Countess Ruth of Rosenberg. I will answer the second question, Crown Princess Beatrix couldn't attend the wedding as she was in the last months of her pregnancy with Johan Friso. Her husband attended the wedding to represent the House of Orange.